//
// AuthenticationMessage.cs
//
// Authors:
//   Alan McGovern alan.mcgovern@gmail.com
//
// Copyright (C) 2008 Alan McGovern
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//


using System;
using System.Text;

namespace MonoTorrent.Messages.UdpTracker
{
    public class AuthenticationMessage : Message
    {
        byte usernameLength;
        string username = "";
        ReadOnlyMemory<byte> password;

        public override int ByteLength => 4 + usernameLength + 8;

        public override void Decode (ReadOnlySpan<byte> buffer)
        {
            usernameLength = ReadByte(ref buffer);
            username = ReadString (ref buffer, usernameLength);
            password = ReadBytes (ref buffer, 8);
        }

        public override int Encode (Span<byte> buffer)
        {
            var written = buffer.Length;

            Write (ref buffer, usernameLength);
            WriteAscii (ref buffer, username);
            Write (ref buffer, password.Span);

            return written - buffer.Length;
        }
    }
}
